I lived in Daytona Beach for a few years in the early 1990s. Richard Petty's farewell tour was going on. It didn't get any bigger than Richard Petty.
I have every die-cast car from the farewell tour. Individually or by the set, they're worth nothing.
I also have other rare Earnhardt and Allison cards and die-cast cars that should be worth something. Nope.
I also have a lot of baseball and football cards from that same era, some of them rookies. Zilch.
I think "collectible" is a relative term. If someone says that have a Mickey Mantle rookie card that's worth $2,000 according to Beckett.....well, it's only worth that much if you can find someone that will PAY you that much.
What I'm saying is....good luck, Spitty! Several times over the years I've thought I might be sitting on a nice little nest egg only to be disappointed.
Wish I'd bought guns with that money instead....now THERE'S a collectible that can hold value!